Method and apparatus for forming greensand cores



July l, 1930. J. T. sToNEY 1,768,802

METHOD AND APPARATUS FOR FORMING GREEN SAND CORES Filed Aug. 12l 1926 4Sheets-Sheet 1 gwunto'o atroz wars f|| Il \.\v Jr l 4 v QN .QN u d l RM.N\\ mm n WY M.f A H, kq mn H @w Nm. \&\

July l, 1930. J, T, STONEY 1,768,802

METHOD AND APPARATUS FOR FORMING GREEN SAND CORES Filed Aug. 12, 1926 4Sheets-Sheet. 2

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J. T. sToNEY 1,768,302

METHOD AND APPARATUS FOR FORMING GREEN SAND CORES July 1, 1930.

Filed Aug. 12, 1926 @Sheets-Sheet 3' S11/vanto@ 4 Sheets-Sheet 4 J. T.STONEY Filed Aug. 12, 1926 Qfbf/ METHOD AND APPARATUS FOR FORMING GREENSAND CORES July 1, 1930.

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ltromwq Patented July l, 1930 JOHN '.l. STONEY',` OF CLEVELAND, OHIOME'rHon AND APPARATUS Foa FoRmNG GREENSAND conne Application tiledAugust 12, 1926. Serial No. 128,782.

My invention relates to a method and apparatus for forming green s andcores and positioning the same with respect to the two halves of themold.

b' The principal feature of the invention resides -in the use of greensand for forming again and which is not the case when thesand cores areonce baked. So far as is known there has never been any satisfactorymethod or apparatus produced which is capable of forming cores of greensand and positioning them absolutely-with respect to the molds, thelpositioning being effected from the first step in the method. Theselcores heretofore have been formed of sand and baked and then positionedwithin the mold and because of the necessity of having to` bake the sandcores the sand could not be used over again and this alone resulted inconsiderable loss of sand and money.

The principal reason for not having utilized green sand heretofore,`informing cores, has been due to the fact that` absolute accuracy isessential in forming these cores and no practical apparatus has beenconceived up to this time which so' formed and held the green sand topermit any amount of handling without injury to the core. My apparatusis so designedy and the core so supported and reinforced that it can behandled considerably`without fear of injury to the core. Furthermore,the sand from the core can be broken up after the core has been used inthe La mold and sifted and used over again in making another core. l

A further object of the invention is to provide apparatus of the typefor the purpose mentioned, which has interengaging portions i0 .sopositioned that the correct location of the core within the mold isassured from' the be'- ginning of the formation of the core andcontinues so throughout the operation.

Another object. of the invention is to provide apparatus which has meansfor conveniently and positively transferring the core through thevarious steps of the method in a quick and true manner and withoutinjury thereto.

10 A still further object of the inventionl is Ain' production and areduction in operating -costsand costs of products-is the result. .thecores which may belused over andover Jigs.

to provide an' apparatus which has the varil ous parts so .associatedthat a considerable saving in time in forming and placing the core 1sassured and, therefore, an increase The invention further resides in theconstruction of the variousparts of the apparatus which are, novel andnew.

With the objects above indicated, and other objects hereinafterexplained in view, my invention consists in the method and apparatus andthe details of construction of the various elements hereinafterdescribed and claimed.

Referring to the drawings "Fig. 1 is a sideelevationalviewof the corebox. 'A

' Fig. 2 is a front elevational View of the same. v

Fig. 3 is a top plan view of the core'box with the arbor supportingmeans removed.

Fig. 4 is a perspective view of a pair of green sand cores supported ona pair of 5 Fig. 5 is a cross sectional view of the half. mold showingthe position of the cores and their supporting jig with respect thereto.

Fig. 6 is a top plan view of the jigs showing the positioning means andthe position of the cores with respect thereto.

Fig. 7 isa side elevational view of the arrangement shown in Fig. 6.

Fig. 8 is a sectional view on line 8-8 of Fig. 5 showing how thecoresare supported in the mold.

In the drawings, 10 indicates generally aA core box which has a base 11supported on any suitable means 12.v The core box 10 comprisesa frontmember 13 which has sides 14 and 15 extending at right angles and formedintegrally therewith and which extend upwardly for about half the heightof the front member 13, as indicated at 20. The rear member 16 issimilarly shaped and has sides 17 and 18 extending at right angles andformed integrally therewith which extend upwardly to a heightcorresponding to the sides 14 and v15. The sides 14 and 15 engage alongtheir ends with the ends of the sides 17. and 18, aS

indicated at 19, thereby forming a box which is substantially squareShaped in cross section.

Side members 21 and 22 engage with the upper half of the front member 13and rear member 16 respectively and the lower edge thereof rests uponthe upper edge 23 formed by the sides 14 and 18 and the sides 15 and 17.The inner faces f these upper side members 21 and 22 correspond to theupper edges of the front member 13 and rear member 16 and assembled theyform a substantially enclosed core box 10.

The base 11 is provided with studs 24 which extend upwardly therefromand engage with openings 25 formed in the lower surface of the rearmember 16 for the purpose of positioning the complementary members. Alocking arm 26 is pivotally attached at 26aL to the sides 14 and 15 ofthe front member 413 and engages a stud 27 secured to the sides 17 and18 of the rear member 16. The locking arm 26 has secu-red thereto anextension 28 as a means for disengaging the same from the stud 27. k

A stud 29 on the ends of the sides 14 and 15 fits into recesses 30 inthe adjacent ends of the sides 17 and 18 and serves to align the two'side members with respect to each other. Sirriilar studs 31 extendinwardly from the upper side member 22 into recesses 32 in the upperportion of the front memberv 13 and rear member 16, and studs 33 extendinwardly from the upper side member 21 into recesses 34 in the upperportion of the front member 13 and rear member 16 but on opposite sidesthereof. These interengaging portions are for-the purpose of aligningthe upper side members 21 and 22 with`respect to the front member 13 andrear member 16.

The upper side members 21 and 22 are provided With studs 35 and 36 whichextend out- Wardly from the ends therefrom and a detachable locking arm37 has a hook 38 at one end engaging thestud 35 and a depending arm 39at the opposite end engaging the stud 36 which serves to maintain theupper side upper portion of the front member 13 and rear member V16. Ahandle 37*al is formed upon the end of the arm 37-beyond the dependingarm 39 for affording a means for disengaging the locking arm-37 from thestu-ds `35 and 36.

The base 11 is adapted to receive a pair of circular T-shaped members40' which fit into correspondingly `shaped recesses41 and are .c securedin place by means of screws orbolts site ends engage lugs or studs 46 onthe inner surface of a plate 47. This plate 47 is detachably mounted onthe upper end of the upper side member 22 by means of studs 48 securedto the under-sideof the plate 47 which studs fit into recesses 49 in theupper end of the upper side member 16.

The arbors 45 have a spider 50 associated therewith near theirupper endsfor the purpose of'reinforcing the green sand forming the core. Thisspider 50 assumes a horizontal position within the core box to thearbors 45. A

In forminga green sand core and employ ing the apparatus thus fardescribed, the front 13 and back 16 are positioned upon the base 11, thepins 24 engagingwith the recesses 25 and the pins 29 in the ends 14 and15 engaging with the recesses. 30 in the adjacent ends 17 and 18.` Thesefront and back members are then locked together by means of the lockingarm 26 engaging with the pins 27 on the sides 17 and`18.

The upper sides 21 and 22 are then attached and'positioned by means` ofthe pins 31 and 33 engaging the recesses 32 and 34 in the upper portionsof the front 13 and back 16. These sides are then locked in position bymeans of the locking arm 37 engaging the pin 35 at one end, and the pin36 at the opposite end. Y

The arbors 45 are next placed within the core box having one endengaging the T- shaped member 41 and being maintained in verticalposition by the detachable arms 47.4

A spider 50 is associated with the arbors 45 to form a reinforcement forthe green sand. The green sand is placed within the core box 10 andpressure is-'applied thereto. The surplus sand on the top is scraped offand the sides and ends of the core box removed, the same being replacedby the jig 56.

Let us assume Anow that the green sand A core formed in the core box 10is for the purpose of forming a four cylinder engine housing, asVindicated at 51, which is provided with a head 52 and a pair ofcylinders 53 extendmembers 21 and 22 1n close relation to the ing fromthe under-side thereof. The heads 52 have 'spaced recesses 54 in theends thereof While similar recesses 55 are provided in the ends of thecylinders 53, the two sets of recesses 54 and 55 being inaxial-alignment. These recesses 54 and 55 expose the ends of the arbors45 which extend throughout the green sand core 51. The cores 51 areformed separately in the core box 10 but are placed sidefby side asindicated in Fig. 4.

A jig 56 is formed with a channel base 57 having upwardly extendingsides 58, thesesides, however, beginning at a central point andextending to the end. The sides 58 preferably lie in-a position adjacentto the cylinders 53. A fiat eXtension6O integral with the side 58extends at right angles thereto` and the upper face is in the same planeas the upper edge of the side 58. Depending ribs 61 are formed integralwith the extension and the side 58, and act as a reinforcing means. Anupstanding peg 62 is positioned substantially centrally of the flatextension 60. It should be here understood that there are two of thesejigs 56 provided which, however, include the same features ofconstruction as heretofore described and only differ in that one jig isrighthand and the adjacent jig is lefthand. The lower edge of the jig 56under the cylinders 53 is rounded at 63 to provide an easy means fortipping the jig and core.

When the complementary core box members have been removed, the jig 56 isSubstituted therefor and engages With one side of the core 51, as shownin Fig. 4. The jig 56 is then tipped over onithe channel 57 and thetipping thereof is facilitated by means of the rounded edge 63.

The righthand jig 56 is then placed upon a supporting and aligning base64 which has a metal strip 65 secured to the front edge by means ofbolts 66 and extends substantially above the upper surface of the base64. L- shaped arms 67 are secured to the sides of the base 64 by meansof bolts 68 and extend outwardly and upwardly With respect to the base64. The upper end of the L-shaped arms 67 is provided with a supportingplate 69 Which extends on each side of the arms 67 and at right anglesthereto. The heights and locations of these arms 67 and the metal strip65 are all predeterminately located With respect to the position whichthe core 51 finally assumes with respect to the half mold. The upperedge of the L-shaped arms 67 also extends above the upper surface of thebase 64 so that the engagement of the metal strlp 65 with the arms 67forms an abutment for the jig 56. When the righthand jig 56 is properlylocated the lefthand jig 56 is placed in proper position adjacentthereto.

with the jigs 56 and the supporting platform 64 in the respectivepositions heretofore described, a second jig 70 is used to transfer thecore 51 to the mold 86. This jig 70 is composed of a rectangular framehaving end walls 71 and a front wall 73 and a rear wall 74 all formedintegrally.

The end walls 71 are each provided with handles 75 adjacent their endswhich serve as a convenient means for lifting the jig 70.

Aligning extensions 76 integral with the sides 71 are properly locatedwith respect to pins 87 forming a part of the half mold 86. Thesealigning extensions 76 are provided with holes 77 extendingtherethrough.

The jig 70 is further provided with positioning bosses 78 having holes79 extending therethrough. the bosses 78 residing within the frame andare supported h v ribs 80 and 81 secured to the sides 71 and thi` rearwall 74. The holes 79 are so located'that when they engage with the pins62 on the jig 56 the front wall of the jig 70 rests upon the flatextensions 69 of the arms 67 secured to the supporting platform 64.

The front Wall 73 and the rear Wall 74 have slidably mounted thereinlocking bolts 82 which have a depending leg 83 integral with the innerend thereof and a stud 84 extending forwardly of the arm 83 which isadapted to studs 84 have been inserted into the ends of.

the arbors 45 of the cores 51, the jig 70 is lifted from the jig 56 andsupporting platform 64. and placed upon the half mold 86. This half mold86 is provided with upstanding pins 87 which form a part of most moldsfor aligning the drag with respect to the cope. The holes 77 in theextensions 76 of the jig 7 0 are so located that they readily engagethese pins 87 of the half mold 86 and in so engaging position the cores51 correctly with respect to the mold 86. i

The locking bolts 82 are then withdrawn; disen aging the studs 84 fromthe ends of the ar ors 45, and the jig 70 is then removed by the handles75 leaving the cores 51 resting upon portions of the mold 86 as shown inFig. 8. The cope or upper half of the mold (not shown) is then loweredinto proper position by its engagement with the pins 87 and all of themembers are then locked in place.

It is to be understood that While I have described certain apparatuswhich preferably scts forth the desired construction, I am not to belimited thereto as many necessary and desirous changes may be madeWithout departing from the spirit of the invention as disclosed in theappended claims.

Having thus described my invention, I claim:

1. The method of positioning a green sand core with respect to a. moldwhich comprises positioning the core within a jig, positioning a secondjig with respect to the core. positioning the core Within the secondjig, positioning the second jig with respect to the mold, and removingthe second from the core and mold.

2. The method of positioning green sand cores with respect to a mold.which comprises transferring the core to a jig, positioning a second jigwith respect tothe tirst jig and the core. securing the core, to thesecond jig, positioning in a, predetermined position the lll) second jigcarrying the core with respect to the mold, and removing the second jigfrom the core and mold.

3. The method of positioning a pair of green sand cores with respect toa mold which comprises forming a pairof suitable cores in a core box,transferring each core to a separate jig, placing the jigs side byside,positioning a second jig With respect to the cores and first jigs,securing the cores to the second jig, positioning in a predeterminedposition the second ji carrying the cores with respect to the mol andremoving the second jig from the cores and mold.

4. The herein described method which comprises forming a core in a corebox, transferring the core to a jig, placing a second jig in apredetermined position with respect to the first jig and core, securingt-he core to a second jig, placing the second jig and Icore in apredetermined relationship with respect to a half mold and removing thesecond jig from the'core and mold.

5. The herein described method which comprises forming a suitable corein a core box, transferring the core to a ig, placing the jig and coreon a supporting ase in a predetermined position, placing a second jig ina predetermined position with respect to the core and first jig,securing the core to the second jig, placing the second jig and core ina predetermined position with relation to a half mold, and removing thesecond jig from the core and mold.

6. The herein described method which comprises forming a suitablef greenSand core in a core box, transferring the core to a jig having acomplementary surface, aligning the jig `on a supporting base, aligninga second jig with respect to the first jig and core, securing the coreto the second jig, transferring in a predetermined position with respectto a half mold the second jig and core, and removing the second jig fromthe core 'and mold.

7. The herein described method which comprises forming a pair ofsuitablev green sand cores in core boxes, transferring the cores to apair of jigs, placing the jigs side .by side in a predetermined positionon a vsupporting base, placing a second jig in a predetermined positionwith resp'ect to the pair of jigs and cores, securing the cores to thesecond jig, transferring-the cores by means of the second jig to'a halfmold and in a predetermined position, and removing the second jig fromthe cores and mold.

8. In an apparatus of the type described, a core box for forming greensand cores which have' positioning means associated therewith, a jig towhich the core is .transferred, a second jig adapted to engage the firstjig and provided with means tn engage the core, and means on the secondjig adapted a jig to which the core is transferred, said f jig beingprovided with positioning means, a second jig provided with meanscooperating with the positioning means and having mounted thereinmembers for engaging said core, said second jig being further provided'Y with means adapted to engage With a portion of 'a half Ymold toposition the core with respect to said mold. e

10. In an ap aratus of the type described, avcore box for orming greensand cores, one or more arbors positioned within said box and aroundwhich the green sand is formed, a jig -to which the core is transferred,said jig provided with positioning means, a second jig provided withmeans cooperating with the positioning means and having mounted thereinmeans for engaging the arbors of said core, said jig being furtherprovided With means for engaging a portion of a half mold for1(positioning the core with respect to the mo 11. In an apparatus of thetype described, a .core box for forming green sand cores, means forpositioning one or more arbors within the core in relation toftheposition of the core in the mold, a jig to which the core istransferred, a second jig provided with means for engaging the firstjig, said second jig being further provided with slidable means forengaging the ends of said arbors, and means mounted on the second jigadapted to cooperate with portions of a half mold to position the corewith respect to the mold.

12. In an apparatus of the type described,

.a core box for forming green sand cores on a ;spect to said mold.

13. In an apparatus for positioning green sand cores with respect to amold, the combination of a core, a jig supporting said core,

a second jig supported by the first jigl and provided with meansengaging said core, and means for positioning the second jig withrespect to a mold.

14. In a device for positioning green sand cores with respect to a mold,the combination of a core provided with engaging means in the endsthereof, a jig supporting said core, a

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second jig provided with means for engaging the irst jlg in apredetermined position, said second jig being further provided withmeans for en aging the engaging means in 5 the ends of te core, andfurther means on said second jig for positioning the same with respectto the mold.

15. In an'apparatus of the type described, the combination of a jigadapted to receive a core therein, aligning means on said jig, a.supporting base, aligmng means on said base for engagement with saidjig, and a second jig engaging the aligning means on the first jig andprovided with means adapted to engage the core.

16. In an apparatus of the type described, the combination of a jigadapted to receive a core therein, a second jig engaging the first jig,said ji having interengaging parts and means sli ably mounted in thesecond jig adapted to engage the ends of the core.

l17. The method of positioning green sand cores with respect to a moldwhich comprises forming a core of green sand, engaging said core at aplurality of points, lifting the core by applying a common force to thepoints so engaged, and placing the core in the mold by engagingabutments fixed with respect to said points, with abutments fixed withrespect to said mold.

In testimony whereof, I hereunto aiix my signature.

JOHN T. STONEY.

